[jartelt]

People who throw really hard probably benefit from the higher speed discs, but there are also very good players that drive 9 speeds. Advanced players will carry a variety of drivers with differing speeds because they will want different flight paths depending on the given hole layout. Also, whether you are throw into a headwind or with a tailwind changes how fast the disc is flying (relative to the air).

In general, most drivers are designed to fly in a "S" shaped flight path. When you get this full flight path, you get the most distance. For a right hand player throwing backhand that means your throw should draw slightly to the right at first, straighten out, and then finish with a fade to the left.

If you throw a disc that is rated at too high a speed for you, it will just quickly fade to the left and go into the ground. You often see beginners chucking their drivers way out to the right in order to compensate for this quick turn to the left. It's just really hard to get distance when you do this because the high speed disc really wants to turn left and dive into the ground.

If you throw a disc that is rated too low a speed for you, it will draw too far to the right and will not straighten out and come back left. In this case, you should either throw a bit less hard or move up to a higher speed disc. For beginners it is better to start here because you can actually get a feel for how throwing speed changes the disc flight path.